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There is a tube about 1 foot long on the return side of the valve. Not sure about the rad. The flow looks Ok ish - considering it is microbore.

:roll: Hi Folks I bought the house last year, 4 bed detached, built 1980. Boiler is Concorde WRS 55,000 btu, seems to work fine. Have checked the pump, also fine. The system was originally 1/2" pipework. The main pipes under the floorboards are still 1/2", but at some stage somebody has...